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Revert "[POWERPC] DMA 4GB boundary protection"

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This reverts commit 618d3adc35, because
it is superseded by 569975591c.
This commit is contained in:
Paul Mackerras 2007-04-26 17:01:04 +10:00
parent c78f830547
commit 0999ed7f57
1 changed files with 0 additions and 10 deletions
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10
arch/powerpc/kernel/iommu.c
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@ -89,7 +89,6 @@ static unsigned long iommu_range_alloc(struct iommu_table *tbl,
unsigned int align_order)
{
unsigned long n, end, i, start;
unsigned long start_addr, end_addr;
unsigned long limit;
int largealloc = npages > 15;
int pass = 0;
@ -160,15 +159,6 @@ static unsigned long iommu_range_alloc(struct iommu_table *tbl,
}
}
/* DMA cannot cross 4 GB boundary */
start_addr = (n + tbl->it_offset) << PAGE_SHIFT;
end_addr = (end + tbl->it_offset) << PAGE_SHIFT;
if ((start_addr >> 32) != (end_addr >> 32)) {
end_addr &= 0xffffffff00000000l;
start = (end_addr >> PAGE_SHIFT) - tbl->it_offset;
goto again;
}
for (i = n; i < end; i++)
if (test_bit(i, tbl->it_map)) {
start = i+1;